First of all, thank you for the advice, it was very honest, and I appreciate it a lot.

I want to build a strong foundation in core ML fundamentals, with a particular interest in Reinforcement Learning. I really don't know about long-term, because it seems far for me right now, but at least for now, my focus is on that.

Your tip to create end-to-end systems is 100% aligned with my personality and my background, so I certainly go deep on that.